EP3559604A1 - Procédé permettant de faire fonctionner un débitmètre à induction magnétique et débitmètre à induction magnétique - Google Patents

Procédé permettant de faire fonctionner un débitmètre à induction magnétique et débitmètre à induction magnétique

Info

Publication number
EP3559604A1
EP3559604A1 EP17801713.3A EP17801713A EP3559604A1 EP 3559604 A1 EP3559604 A1 EP 3559604A1 EP 17801713 A EP17801713 A EP 17801713A EP 3559604 A1 EP3559604 A1 EP 3559604A1
Authority
EP
European Patent Office
Prior art keywords
medium
measuring
impedance
magnetic field
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17801713.3A
Other languages
German (de)
English (en)
Other versions
EP3559604B1 (fr
Inventor
Thomas KÜNG
Günther Bähr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP3559604A1 publication Critical patent/EP3559604A1/fr
Application granted granted Critical
Publication of EP3559604B1 publication Critical patent/EP3559604B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/60—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor

Definitions

  • the invention relates to a method for operating a magneto-inductive
  • Magnetic-inductive flowmeters have been used for a long time
  • Flow measurement is based on the induction of a flow-dependent electrical voltage in a conductive, flowing through a measuring tube medium by a magnetic field, which magnetic field is aligned perpendicular to the flow direction.
  • the magnetic field is usually generated by a coil system with one or more coils.
  • the flow-dependent voltage is tapped by at least two measuring electrodes and evaluated by a measuring device.
  • the flow of the medium through the pipeline can be determined from the measured voltage and the known magnetic field.
  • the medium is subjected to magnetic fields of alternating polarity in order to minimize parasitic effects which, independently of the presence of a magnetic field, lead to a measurable voltage between the measuring electrodes and thus falsify a flow measurement.
  • the document DE10312058A1 describes such a flowmeter. Another possibility to detect parasitic effects is, between phases with magnetic field resting phases without
  • the object of the invention is therefore to propose a method for operating a magnetic-inductive flowmeter and such a flowmeter, by which the loss of time is minimized.
  • the object is achieved by a method according to the independent claim 1 and by a magnetic-inductive flowmeter according to the
  • volumen takelaces a medium in a measuring tube which comprises magnetic-inductive flowmeter: a measuring tube for guiding the medium; a magnet system with at least one coil system for generating a
  • Magnetic field in the medium wherein the magnetic field is substantially perpendicular to a Meßrohrachse, wherein the magnetic field by applying an electrical
  • Coil voltage is caused to the coil system; at least one pair of measuring electrodes arranged in the measuring tube for detecting an induced by the magnetic field electrode voltage in the medium, which
  • Electrode voltage is substantially proportional to the flow rate and the field strength of the magnetic field; a measurement / operating circuit for operating the magnet system and for evaluating the electrode voltage, the magnetic field is generated during a feed phase and the electrode voltage is detected, wherein the feed phase has a measurement phase, in which measurement phase the
  • Magnetic field is substantially constant, with a measurement of the electrode voltage during the measurement phase to calculate the flow of the medium
  • the measuring system includes the magnet system as well as the medium in the area of the magnetic field as well as the measuring electrodes with supply lines for the measuring / operating circuit.
  • the magnet system can also have a field feedback for conducting the magnetic field outside the measuring tube.
  • the magnet system can have at least one pole shoe which is set up to conduct the magnetic field between the coil system and the measuring tube.
  • the at least one coil system can each have a coil core.
  • the electrode voltage is produced by a deflection of charge carriers caused by the flow of the medium through the measuring tube through the magnetic field, wherein the deflection direction is dependent on the polarity of the charge carriers. This results in a separation of positively charged from negatively charged charge carriers and thus an electrical voltage.
  • the course of the electrode voltage is corrected as a function of the profile of the deflection.
  • an average deflection is calculated by averaging the deflection of at least one voltage pulse of at least two supply phases, after calculating the averaged deflection correcting the value of the electrode voltage or the measured value of the electrode voltage of a feed phase.
  • a measurement of a first impedance of a circuit comprising the measuring electrodes as well as the medium and / or a second impedance of the medium is carried out,
  • a measured value of a first impedance of the circuit comprising the measuring electrodes and supply lines of the measuring electrodes for the measuring / operating circuit and the medium and / or a measured value of a second impedance of the medium, wherein the measured value of the first impedance and / or the measured value of the second impedance is used to analyze the voltage pulse.
  • the measured value of the first impedance is determined by means of the measuring electrodes and / or the measured value of the second impedance is determined by means of an impedance probe.
  • the electrode voltage is sampled during the feed phase at least twice, and in particular at least twenty times, and preferably at least fifty times.
  • the curve of the voltage pulse is fitted by at least one fit function, wherein the fit function information about the time and amplitude of a
  • Fitticiansparametern is described.
  • the fit function can be selected from a purely mathematical point of view. However, it is also possible to use physical or technical conditions when selecting the fit function and / or when restricting parameters of the fit function.
  • the fit engages at least in a first
  • the fit accesses a monotonically decreasing function, for example a power function, at least in a second time interval.
  • a monotonically decreasing function for example a power function
  • Fit function parameters selected from a look-up table selected from a look-up table.
  • Exemplary parameter used during fitting In one embodiment of the method, a measurement of a first impedance of a current loop comprising the measuring electrodes as well as the medium and / or a second impedance of the medium during fitting.
  • the magnitudes of the magnetic fields of the measuring phases of adjacent feed phases differ from one another by less than 1% and in particular less than 0.1%.
  • the feed phases on which the calculation of the averaged deflection is based are preceded by the first feed phase or the first feed phase.
  • the feed phases underlying the calculation of the averaged deflection are at least partially preceded by the first feed phase, which are based on the calculation of the averaged deflection
  • Feeding phases of the first feeding phase at least partially follow.
  • a difference of corrected measured values of the electrode voltage or a difference of corrected electrode voltages of the measuring phases of two successive feeding phases is used to determine a flow measured value.
  • the flowmeter has an impedance probe for detecting the second impedance of the medium.
  • the measuring / operating circuit has an interface for the transmission or acceptance of information relating to an externally determined impedance of the medium.
  • the magnet system comprises at least one field feedback, which is set up to at least partially guide the magnetic field outside the measuring tube between the measuring tube side opposite the coil system and the coil system.
  • FIG. 1 outlines a schematic process flow for operating a
  • FIG. 2 outlines an exemplary section of courses of magnetic fields and electrode voltages.
  • FIG 3 shows an exemplary cross section through a magnetic-inductive flowmeter according to the invention.
  • FIG. 1 outlines a sequence of a method 100 according to the invention for operating a magneto-inductive flowmeter.
  • a flowmeter comprises, as described in FIG. 3: a measuring tube for guiding the medium; a magnet system with at least one coil system for generating a
  • Magnetic field in the medium wherein the magnetic field is substantially perpendicular to a Meßrohrachse, wherein the magnetic field by applying an electrical
  • Coil voltage is caused to the coil system; at least one pair of measuring electrodes arranged in the measuring tube for detecting an induced by the magnetic field electrode voltage in the medium, which
  • Electrode voltage is substantially proportional to the flow rate and the field strength of the magnetic field; a measuring / operating circuit for implementing the method according to the invention.
  • the magnetic field is generated during a feed phase and the electrode voltage is detected.
  • the feed phase has a measurement phase in which the measurement phase, the magnetic field is substantially constant, wherein a measured value of the electrode voltage during the measurement phase is used to calculate the flow of the medium.
  • a magnetic field of opposite polarity is generated during a subsequent feed phase, wherein the switching between feed phases causes the generation of an electrical voltage pulse in the medium.
  • the voltage pulse is analyzed in order to obtain information about a profile of a deflection of the
  • the final state is a state of a steady measuring system, wherein the measuring system, the magnetic system and the medium in the magnetic field and the
  • Measuring electrodes with leads to the measurement / operating circuit comprises.
  • a third method step 103 the final state is used to calculate a flow.
  • FIG. 2 outlines an exemplary and schematic excerpt from the courses of magnetic fields and electrode voltages over a time t over several feed phases , wherein an upper curve M shows the course of magnetic fields during feed phases 1 to 5, and wherein a lower curve E the course of
  • Electrode voltages during the feed phases 1 to 5 shows.
  • the course of the magnetic fields or electrode voltages during a single phase is characterized by a transient in a final state at the beginning of the phase and a stay in the final state after termination of the transient, wherein the settling time of the magnetic fields is shorter than the settling time of the electrode voltages. This is due to the fact that the electrode voltages react flow-dependent on the magnetic fields, these reactions then further
  • Electrode voltage during the final state is determined by the current
  • the medium is acted upon by the magnet system with an at least partially constant magnetic field, wherein the magnetic field is generated by driving a coil system with a coil current.
  • an electrode voltage or a measured value of an electrode voltage is used at least during a final state of a feed phase.
  • a difference of measured values of the electrode voltage or a difference of electrode voltages of two successive feed phases is used to determine a flow measurement value for measuring the flow.
  • the electrode voltage after a switching operation of the magnet system depends not only on the dynamics of the magnet system, but also on the dynamic behavior of the boundary layers.
  • the dynamics of the electrode voltage is determined by the
  • the electrode voltage shows a voltage pulse which decays into a state of substantially constant voltage, the decay, inter alia, results in a decay of the voltage across the boundary layer, wherein the voltage pulse as a result of the change of the magnetic field and the charge Boundary layer capacitance represents a disturbance of the electrode voltage.
  • the polarity of a voltage pulse is dependent on the polarity of the change of the magnetic field with supply phase change.
  • Feed phase allows the acquisition of a deflection of the electrode voltage relative to the final state of the measuring system, which final state is determined essentially by the flow of the medium and by the field strength of the magnetic field.
  • a fit of the course of the electrode voltage with a suitable fit function allows, for example, a direct calculation of the final state as a fit parameter with associated uncertainties. It is also conceivable to subtract or correct a function determined by a fit from a measured course of the electrode voltage. In this case, the course of the electrode voltage in the absence of further electrode voltage-distorting effects in the
  • Substantially constant flow at least over a portion of the feed phase substantially constant.
  • a final value can be determined, for example, by averaging individual measured values of the electrode voltage from the constant part.
  • the electrode voltage can also rise or fall in the steady state.
  • the electrode voltage often does not reach a final state, so that in the teachings of the prior art, a flow measurement would be wrong.
  • meaningful information about the final state can be obtained by incorporating a fit according to the invention even without reaching a final state.
  • Voltage pulses of several feed phases are averaged before a statement about a final state of a course of an electrode voltage of a feed phase is given.
  • Fitting can also take account of physical-technical boundary conditions. For example, when selecting the fit function or from
  • Parameters or parameter ranges of the fit function a measured value of a first
  • Impedance of a current loop comprising the measuring electrodes and the medium and / or a measured value of a second impedance of the medium are used. Further boundary conditions can be determined by at least one device-specific or
  • a function used for fitting the course of the electrode voltage can be selected from a look-up table, in which look-up table at least one device-specific and / or at least one exemplary typical and / or at least one application-specific parameter are stored suitable fit functions and / or fit function parameters are linked.
  • the curves of the individual magnetic fields are exemplary. In particular, too
  • an overvoltage is applied to the coil system so that the magnetic field reaches a desired state more quickly.
  • a desired state more quickly.
  • FIG. 3 shows a cross-section through a magnetic-inductive flowmeter 1 according to the invention with a measuring tube 10;
  • FIG. a magnet system 20 with
  • the magnet system acts on the medium in the measuring tube 10 with a magnetic field which is aligned in the direction of the arrow 23.
  • the magnetic field as well as the flow of the medium through the measuring tube ensure the creation of an electrode voltage in Direction of the arrow 33.
  • the electromagnetic flowmeter may further include a field feedback 40 and / or include an impedance probe 60.
  • the measuring electrodes 31, 32 and the coil system 21, 22 and the impedance probe are connected to a measuring / operating circuit 50, which measuring / operating circuit 50 is adapted to operate the coil system, the measuring electrodes and optionally the impedance probe.
  • the impedance probe is designed to detect the impedance of the medium.
  • the measuring / operating circuit 50 may have an interface S for the transmission or acceptance of information relating to an externally determined impedance of the medium.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un procédé (100) pour faire fonctionner un débitmètre à induction magnétique (1) servant à mesurer la vitesse d'écoulement ou le débit volumique d'un milieu dans un tube de mesure et un tel débitmètre, le milieu étant soumis à l'action de champs magnétiques de polarité et d'intensité de champ différentes, le changement de champs magnétiques produisant une impulsion de tension dans le milieu, une analyse de l'impulsion de tension étant utilisée pour calculer une correction d'une courbe de tension d'électrode.
EP17801713.3A 2016-12-20 2017-11-22 Procédé permettant de faire fonctionner un débitmètre à induction magnétique et débitmètre à induction magnétique Active EP3559604B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016124977.7A DE102016124977B4 (de) 2016-12-20 2016-12-20 Verfahren zum Betreiben eines magnetisch-induktiven Durchflussmessgeräts und ein solches Durchflussmessgerät
PCT/EP2017/080059 WO2018114190A1 (fr) 2016-12-20 2017-11-22 Procédé permettant de faire fonctionner un débitmètre à induction magnétique et débitmètre à induction magnétique

Publications (2)

Publication Number Publication Date
EP3559604A1 true EP3559604A1 (fr) 2019-10-30
EP3559604B1 EP3559604B1 (fr) 2021-02-17

Family

ID=60421792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17801713.3A Active EP3559604B1 (fr) 2016-12-20 2017-11-22 Procédé permettant de faire fonctionner un débitmètre à induction magnétique et débitmètre à induction magnétique

Country Status (5)

Country Link
US (1) US11047719B2 (fr)
EP (1) EP3559604B1 (fr)
CN (1) CN110178001B (fr)
DE (1) DE102016124977B4 (fr)
WO (1) WO2018114190A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016124976A1 (de) * 2016-12-20 2018-06-21 Endress+Hauser Flowtec Ag Verfahren zum Betreiben eines magnetisch-induktiven Durchflussmessgeräts und ein solches Durchflussmessgerät
CN115484980A (zh) 2020-04-29 2022-12-16 安进公司 药物配制品

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408497A (en) 1981-12-22 1983-10-11 Hokushin Electric Works, Ltd. Electromagnetic flowmeter for measuring ferromagnetic slurries
JPS58120118A (ja) * 1982-01-12 1983-07-16 Yokogawa Hokushin Electric Corp 電磁流量計
JPS60195418A (ja) 1984-03-16 1985-10-03 Yokogawa Hokushin Electric Corp 電磁流量計
JP3117327B2 (ja) * 1993-06-21 2000-12-11 株式会社東芝 電磁流量計
DE19621132A1 (de) 1996-05-24 1997-11-27 Bailey Fischer & Porter Gmbh Verfahren und Vorrichtung zur magnetisch-induktiven Durchflußmessung
EP0969268A1 (fr) * 1998-07-03 2000-01-05 Endress + Hauser Flowtec AG Méthode de régulation de courant de bobine d'un capteur de débit électromagnétique
JP3915459B2 (ja) 2001-09-20 2007-05-16 横河電機株式会社 電磁流量計
DE10312058A1 (de) 2003-03-18 2004-09-30 Endress + Hauser Flowtec Ag, Reinach Vorrichtung zum Messen des Volumenstroms eines Messmediums in einem Messrohr
EP1464930B1 (fr) * 2003-04-02 2016-06-08 ABB Limited Débitmètre électromagnétique
CN100453979C (zh) * 2007-11-20 2009-01-21 浙江大学 电容式电磁流量计
US9696188B2 (en) * 2013-03-14 2017-07-04 Rosemount Inc. Magnetic flowmeter with automatic adjustment based on sensed complex impedance
DE102013112373A1 (de) * 2013-11-11 2015-05-13 Endress + Hauser Flowtec Ag Verfahren zum Betrieb einer magnetisch-induktiven Messeinrichtung
DE102014119453A1 (de) * 2014-12-22 2016-06-23 Endress+Hauser Flowtec Ag Verfahren zur Defekterkennung der Signalleitung zwischen einer Elektrode und einer Mess- und/oder Auswerteeinheit eines magnetisch-induktiven Durchflussmessgerätes

Also Published As

Publication number Publication date
WO2018114190A1 (fr) 2018-06-28
EP3559604B1 (fr) 2021-02-17
US11047719B2 (en) 2021-06-29
CN110178001B (zh) 2021-06-22
US20190383653A1 (en) 2019-12-19
DE102016124977A1 (de) 2018-06-21
CN110178001A (zh) 2019-08-27
DE102016124977B4 (de) 2021-12-16

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